US Bridges

SH121NB /US75 Conn over US 75 Sbfr & SH 121 Nbfr

Good

Collin County, Texas · At Int US 75 & SH 121 · Structure no. 180430036404616

Built
2011
14 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,669 ft
16 main spans
Daily traffic
6,719
2020 count
Owner
Toll Authority
Local Toll Authority

About this bridge

SH121NB /US75 Conn over US 75 Sbfr & SH 121 Nbfr is a prestressed concrete stringer/multi-beam or girder carrying SH121NB /US75 Conn over US 75 Sbfr & SH 121 Nbfr in Collin County, Texas. It was built in 2011, so it is 14 years old, younger than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,719 vehicles a day, projected to reach 9,407 by 2040. The structure is 1,669 ft (508.7 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH121NB /US75 Conn
CrossesUS 75 Sbfr & SH 121 Nbfr
LocationAt Int US 75 & SH 121
RouteU.S. Route 121
CountyCollin County
StateTexas
Coordinates33.15415, -96.65358
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans16
Design loadHL 93
Structure length1,669 ft (508.7 m)
Longest span111 ft (33.8 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,719 (2020)
Projected traffic9,407 by 2040
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerLocal Toll Authority
Maintained byLocal Toll Authority
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH121NB /US75 Conn over US 75 Sbfr & SH 121 Nbfr built?

It was built in 2011, making it 14 years old in 2025.

What condition is SH121NB /US75 Conn over US 75 Sbfr & SH 121 Nbfr in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.

How much traffic does SH121NB /US75 Conn over US 75 Sbfr & SH 121 Nbfr carry?

About 6,719 vehicles per day (2020 count).

How long is SH121NB /US75 Conn over US 75 Sbfr & SH 121 Nbfr?

The structure is 1,669 ft (508.7 m) long with a longest span of 111 ft (33.8 m) and a deck 28 ft wide.

Who owns SH121NB /US75 Conn over US 75 Sbfr & SH 121 Nbfr?

It is owned by the Local Toll Authority.